Yes, since you can't remove Internet Explorer 8 easily in Windows 7, so I might as well Update to 9 when it is released. Eventhough, I would not be using IE 9 much.
Life Hacker
So having the latest version of IE may improve the performance of Windows 7 when using IE's rendering engine in software programs.
It is also a good idea to keep whatever program up to date to protect your PC from viruses and spyware sort of like people who still use Internet Explorer 6 may be more likely to get a virus compared to Internet Explorer 8.
Internet Explorer's rendering engine is also used throughout Windows and with third-party applications as an embeddable component.
Life Hacker
So having the latest version of IE may improve the performance of Windows 7 when using IE's rendering engine in software programs.
It is also a good idea to keep whatever program up to date to protect your PC from viruses and spyware sort of like people who still use Internet Explorer 6 may be more likely to get a virus compared to Internet Explorer 8.